A wideband subsample delay estimation technique

An adaptive algorithm for estimating the delay between two noisy wideband signals is presented. The method is based on the explicit time delay estimation and breaks the fractional delay filter into two parts, one as the pre-filter and the other as the fractional part. The adaptation changes the second filter. A bias free estimate of the delay is produce, which is showed to be convergent in both mean and variance. This technique in comparison with the conventional Sinc filter used for wideband signals does not need to a large number of changing terms for the filter and also speeds up the convergence.